US6550301B2 - Method for producing an inclined helical spring - Google Patents

Method for producing an inclined helical spring Download PDF

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Publication number
US6550301B2
US6550301B2 US09/915,272 US91527201A US6550301B2 US 6550301 B2 US6550301 B2 US 6550301B2 US 91527201 A US91527201 A US 91527201A US 6550301 B2 US6550301 B2 US 6550301B2
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United States
Prior art keywords
coil
diameter
spring
substantially circular
half section
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US09/915,272
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US20020011090A1 (en
Inventor
Keiji Hasegawa
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Chuo Hatsujo KK
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Chuo Hatsujo KK
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Assigned to CHUO HATSUJO KABUSHIKI KAISHA reassignment CHUO HATSUJO KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HASEGAWA, KEIJI
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F3/00—Coiling wire into particular forms
    • B21F3/02—Coiling wire into particular forms helically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F3/00—Coiling wire into particular forms
    • B21F3/02—Coiling wire into particular forms helically
    • B21F3/04—Coiling wire into particular forms helically externally on a mandrel or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F3/00—Coiling wire into particular forms
    • B21F3/10—Coiling wire into particular forms to spirals other than flat, e.g. conical
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49609—Spring making

Definitions

  • the present invention relates to a method for producing an inclined helical spring, and more particularly to the method for producing the inclined helical spring for use in a strut type vehicle suspension.
  • helical compression spring Various types have been known heretofore. Among them, a compression spring having an inclined coil axis has been known.
  • British Patent No. 1192766 for example, proposed are improvements in or relating to vehicle wheel suspension assemblies.
  • the British Patent discloses a helical spring which is coiled in the untensioned state with transverse relative displacement of the turns, and when mounted is stressed by lateral relative displacement of the turns of the spring out of the unstressed position thereof to apply a bending moment to the shock absorber in opposition to the bending moment applied by a wheel support.
  • the coil wire When the inclined helical spring is produced by the hot working, the coil wire may be wound according to the processes as shown in FIGS. 10-12. That is, by holding one end of a coil wire HW, which was heated up to a certain temperature to be deformed thermally, on an end of a mandrel 202 by a pressing member 201 , and drawing the coil wire HW by a lead roller 203 in a predetermined direction so as to wind it around the mandrel 202 , the inclined helical spring 50 as shown in FIG. 12 can be formed.
  • the lead roller 203 is set to provide a larger inclined angle ⁇ 1 for a half of a coil as shown in FIG.
  • the diameter D 1 of the half coil as shown in FIG. 10 is larger than the diameter D 2 of the half coil as shown in FIG. 11 . Therefore, by repeating the processes as shown in FIGS. 10 and 11 according to a half coil cycle, can be produced the inclined spring 50 having the coil axis inclined at the angle ⁇ to the opposite end faces, as shown in FIG. 12 .
  • a method for producing an inclined substantially cylindrical helical spring having a plurality of substantially circular coils along an inclined coil axis includes the steps of forming each substantially circular coil constituting a predetermined portion of the substantially cylindrical helical spring between one end and the other one end of the spring to be increased and decreased in diameter successively along the longitudinal axis of the spring, with a half section of the coil increased or decreased in diameter compared with a diameter of a preceding or subsequent half section of the coil; and forming the longitudinal axis of the spring in a free state of the of the spring to be inclined substantially at a predetermined angle to an axis to be mounted with the spring.
  • the method for producing the substantially cylindrical inclined helical spring may include the steps of forming each substantially circular coil constituting a substantially circular helical spring of the whole length thereof between one end and the other end of the spring to be increased and decreased in diameter successively along the longitudinal axis of the spring, with a half section of the coil increased or decreased in diameter compared with a diameter of a preceding or subsequent half section of the coil; and forming the longitudinal axis of the spring to be inclined substantially at a predetermined angle to an axis to be mounted with the spring.
  • each coil is formed with one section having approximately a half of the circumference of each coil divided by a plane including the coil axis is formed to be increased or decreased in diameter, and the other one section followed by the one section having approximately a half of the circumference of each coil is formed to be decreased or increased in diameter.
  • FIG. 1 is a perspective view of an inclined helical spring of an embodiment produced according to a method of the present invention
  • FIG. 2 is a diagram showing a relationship between the number of coils and pitches of an inclined helical spring produced according to an embodiment of the present invention
  • FIG. 3 is a diagram showing a relationship between the number of coils and diameters of coils of an inclined helical spring produced according to an embodiment of the present invention
  • FIG. 4 is a front view of a coiling machine for producing an inclined helical spring according to an embodiment of the present invention
  • FIG. 5 is a front view showing one process for producing an inclined helical spring according to an embodiment of the present invention
  • FIG. 6 is a front view showing another process for producing an inclined helical spring according to an embodiment of the present invention.
  • FIG. 7 is a plan view showing an example of a part of an inclined helical spring under a coiling process according to an embodiment of the present invention.
  • FIG. 8 is a diagram showing a relationship between the number of coils and pitches of the inclined helical spring produced according to another embodiment of the present invention.
  • FIG. 9 is a diagram showing a relationship between the number of coils and diameters of coils of the inclined helical spring produced according to another embodiment of the present invention.
  • FIG. 10 is a front view showing a process in a method for producing an inclined helical spring according to hot working
  • FIG. 11 is a front view showing another process in a method for producing an inclined helical spring according to hot working.
  • FIG. 12 is a front view showing a further process in a method for producing an inclined helical spring according to hot working, and a finished shape of the inclined helical spring.
  • the inclined helical spring 10 has a body portion 13 between an upper end coil 11 and a lower end coil 12 , with a coil axis CA of the body portion 13 inclined at an angle ⁇ to the upper end coil 11 and lower end coil 12 , and formed at a substantially constant pitch.
  • each coil constituting the body portion 13 according to the present embodiment is increased and decreased in diameter in accordance with the number of coils, i.e., along the axis.
  • the diameter of one coil of the body portion 13 is set in such a manner that one section of the one coil having approximately a half of the circumference of the one coil divided by a plane including the coil axis CA is gradually increased in diameter from its local minimum diameter (Db) in the one coil, and reaches its local maximum diameter (Da) in the one coil, and that the other one section following that one section having approximately a half of the circumference of the one coil is gradually decreased from the local maximum diameter (Da), and reaches the local minimum diameter (Db) in the one coil.
  • the upper end coil 11 and the lower end coil 12 are set to be of approximately the same diameter as the portion of the local minimum diameter, while they are not limited to that dimension.
  • the local maximum diameter (Da) and the local minimum diameter (Db) indicate the local maximum value and the local minimum value in each one coil (or, one turn). According to the present embodiment, they are set to be of different values by each one coil according to a desired configuration.
  • the local maximum diameter (Da) and the local minimum diameter (Db) are set to be of different values in the longitudinal direction (by the number of coils), respectively.
  • the relationship in one coil as increased and decreased in diameter is held to be of a predetermined relationship.
  • FIG. 4 illustrates a part of a coiling machine for producing the inclined helical spring 10 as described above, wherein a basic structure is the same as those distributed in the market.
  • a couple of coiling pins of a first pin 101 and a second pin 102 are provided, and the second pin 102 is adapted to move toward and away from a center of each coil to be formed, as indicated by a two-way arrow, so as to adjust the diameter of the coil.
  • the pitch and diameter of the coil as shown in FIGS. 2 and 3 are stored in a program in advance by a numerical control machine (not shown), so that the coiling machine is actuated according to the program.
  • an element wire of the coil (hereinafter, referred to as wire W) is guided by a wire guide 104 and delivered rightward in FIG. 4 . Then, the wire W is bent by the first pin 101 , and bent by the second pin 102 to be coiled in a predetermined diameter. During this process, pitches between neighboring coils are controlled to be of a constant value by a pitch tool 105 . When the wire W is coiled to provide a predetermined number of coils, it is cut by a cutter 106 .
  • the first and second pins 101 , 102 are employed in the present embodiment, a single coiling pin may be employed.
  • the first and second pins 101 and 102 are actuated as follows. At the outset, it is so arranged that the diameter of a section extending from [a reference position ⁇ 1 ⁇ 2 of one coil] to [the reference position], wherein the reference position of each coil is placed in one end of the inclined helical spring to be formed, i.e., the diameter of one section of each coil having approximately a half of the circumference of each coil divided by a plane including the coil axis (i.e., the plane including the reference position, and perpendicular to a drawing plane of FIG. 4) is increased in diameter.
  • the wire W is bent by the first and second pins 101 and 102 , with the second pin 102 being retracted, and formed to gradually increase the diameter of the coil up to the local maximum diameter (Da) as shown in FIG. 5 . Then, it is so arranged that the diameter of a section following the above-described section having approximately a half of the circumference of each coil, i.e., the diameter of a section extending from [the reference position] to [the reference position +1 ⁇ 2 of one coil] is decreased in diameter. In this case, the wire W is bent, with the second pin 102 being advanced, and formed to gradually decrease the diameter of the coil down to the local minimum diameter (Db) as shown in FIG. 6 .
  • the diameter of each one coil is set to be varied according to the order of increasing the diameter and then decreasing the diameter of each one coil, up to the other end of the body portion 13 to be formed, as shown in FIG. 7 . Accordingly, if the diameter of the coil is set as shown in FIG.
  • the coiling is made by the advancing movement and retracting movement of the second pin 102 repeated alternately, by each approximately half portion of the circumference of the coil, then the inclined helical spring 10 having the inclined coil axis, such as the coil axis CA inclined to the opposite end faces as shown in FIG. 1, will be formed.
  • the portion of increasing the diameter and decreasing the diameter of each one coil is formed along the whole length from one end to the other one end of the helical spring, while it may be formed on the predetermined portion between the one end and the other one end of the spring.
  • the body portion without the upper end coil at its one end and the lower end coil at its the other one end may be provided as the portion of increasing the diameter and decreasing the diameter of each one coil, to produce the inclined helical spring having the longitudinal axis of the spring in a free state thereof to be inclined substantially at a predetermined angle to an axis to be mounted with the spring.
  • the local maximum diameter (Da) and the local minimum diameter (Db) may be set in each half circumference portion, and they may be set to be of a constant value, or may be set to be varied in the longitudinal direction, the latter of which may result in an inclined and slightly curved axis.
  • FIGS. 8 and 9 illustrate an inclined helical spring (not shown) according to another embodiment of the present invention, wherein the spring is formed in a truncated cone-shape with an inclined coil axis.
  • the pitch is provided so as to be increased in proportion to the number of coils, as shown in FIG. 8 .
  • the variation of the pitch is caused by forming the configuration of the spring to be the conical shape, so that it is provided as an independent condition, without any relationship with forming the coil axis to be inclined.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Springs (AREA)
US09/915,272 2000-07-31 2001-07-27 Method for producing an inclined helical spring Expired - Lifetime US6550301B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000231184A JP4693211B2 (ja) 2000-07-31 2000-07-31 傾斜コイルばねの製造方法
JP2000-231184 2000-07-31

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030158620A1 (en) * 2002-02-21 2003-08-21 Chuo Hatsujo Kabushiki Kaisha Method and apparatus for producing a helical spring
US20040000180A1 (en) * 2002-06-26 2004-01-01 Nhk Spring Co., Ltd. Method of manufacturing a coil spring having an oblique and straight axial line
US20050210676A1 (en) * 2004-03-24 2005-09-29 Chang-Hsuan Chiu Manufacturing method for a composite coil spring
US20080245122A1 (en) * 2003-10-02 2008-10-09 Panagiotis Anagnostopoulos Method and System of Production of Springs From Wire of Circular or Other Cross-Sectional Area
US20110074078A1 (en) * 2009-09-29 2011-03-31 Chuo Hatsujo Kabushiki Kaisha Spring steel and spring having superior corrosion fatigue strength
US9068615B2 (en) 2011-01-06 2015-06-30 Chuo Hatsujo Kabushiki Kaisha Spring having excellent corrosion fatigue strength
US10472695B1 (en) * 2010-07-19 2019-11-12 Barnes Group Inc. Induction heating of spring

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2390566A1 (de) 2010-05-31 2011-11-30 Siemens Aktiengesellschaft Vorrichtung zum Herstellen von Einbaukörpern für Dampferzeugerrohre
CN107262638A (zh) * 2016-04-06 2017-10-20 哈尔滨飞机工业集团有限责任公司 一种缠异型弹簧的专用工装
JP6367256B2 (ja) * 2016-04-13 2018-08-01 サンコール株式会社 コイルばね
JP6367257B2 (ja) * 2016-04-13 2018-08-01 サンコール株式会社 コイルばね
JP7091636B2 (ja) * 2017-11-24 2022-06-28 三菱自動車工業株式会社 バルブスプリング
CN108506394A (zh) * 2018-06-08 2018-09-07 浙江心梦享家居有限公司 一种改进的沙漏弹簧
CN112427584B (zh) * 2021-01-05 2021-10-22 苏州许本科技有限公司 一种小型弹簧弯折设备
KR102624942B1 (ko) * 2021-02-16 2024-01-15 (주)유에스티 스프링 가스켓 제조 장치

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1017919A (en) * 1910-08-18 1912-02-20 Christian C Grosshans Spring-wheel.
US1867723A (en) * 1928-10-20 1932-07-19 Troy Laundry Machinery Co Convoluted spring
GB1192766A (en) 1966-07-22 1970-05-20 Bayerische Motoren Werke Ag Improvements in or relating to Vehicle Wheel Suspension Assemblies
US6328290B1 (en) * 1998-07-31 2001-12-11 Chuo Hatsujo Kabushiki Kaisha Helical compression spring for a vehicle suspension
US6375174B2 (en) * 2000-01-28 2002-04-23 Chuo Hatsujo Kabushiki Kaisha Curved helical compression spring
US6481701B2 (en) * 2001-03-09 2002-11-19 Delphi Technologies, Inc. Spring having coils of varying diameters

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1017919A (en) * 1910-08-18 1912-02-20 Christian C Grosshans Spring-wheel.
US1867723A (en) * 1928-10-20 1932-07-19 Troy Laundry Machinery Co Convoluted spring
GB1192766A (en) 1966-07-22 1970-05-20 Bayerische Motoren Werke Ag Improvements in or relating to Vehicle Wheel Suspension Assemblies
US6328290B1 (en) * 1998-07-31 2001-12-11 Chuo Hatsujo Kabushiki Kaisha Helical compression spring for a vehicle suspension
US6375174B2 (en) * 2000-01-28 2002-04-23 Chuo Hatsujo Kabushiki Kaisha Curved helical compression spring
US6481701B2 (en) * 2001-03-09 2002-11-19 Delphi Technologies, Inc. Spring having coils of varying diameters

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
U.S. patent application Ser. No. 09/767,267 Hasegawa et al., filed Jan. 23, 2001.

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030158620A1 (en) * 2002-02-21 2003-08-21 Chuo Hatsujo Kabushiki Kaisha Method and apparatus for producing a helical spring
US6836964B2 (en) * 2002-02-21 2005-01-04 Chuo Hatsujo Kabushiki Kaisha Method and apparatus for producing a helical spring
US20040000180A1 (en) * 2002-06-26 2004-01-01 Nhk Spring Co., Ltd. Method of manufacturing a coil spring having an oblique and straight axial line
US6928846B2 (en) * 2002-06-26 2005-08-16 Nhk Spring Co., Ltd. Method of manufacturing a coil spring having an oblique and straight axial line
US20080245122A1 (en) * 2003-10-02 2008-10-09 Panagiotis Anagnostopoulos Method and System of Production of Springs From Wire of Circular or Other Cross-Sectional Area
US20050210676A1 (en) * 2004-03-24 2005-09-29 Chang-Hsuan Chiu Manufacturing method for a composite coil spring
US6986203B2 (en) * 2004-03-24 2006-01-17 Union Composites Co., Ltd. Manufacturing method for a composite coil spring
US20110074079A1 (en) * 2009-09-29 2011-03-31 Chuo Hatsujo Kabushiki Kaisha Coil spring for automobile suspension and method of manufacturing the same
US20110074078A1 (en) * 2009-09-29 2011-03-31 Chuo Hatsujo Kabushiki Kaisha Spring steel and spring having superior corrosion fatigue strength
US20110074076A1 (en) * 2009-09-29 2011-03-31 Chuo Hatsujo Kabushiki Kaisha Spring steel and spring having superior corrosion fatigue strength
US20110074077A1 (en) * 2009-09-29 2011-03-31 Chuo Hatsujo Kabushiki Kaisha Spring steel and spring having superior corrosion fatigue strength
US8328169B2 (en) 2009-09-29 2012-12-11 Chuo Hatsujo Kabushiki Kaisha Spring steel and spring having superior corrosion fatigue strength
US8349095B2 (en) 2009-09-29 2013-01-08 Chuo Hatsujo Kabushiki Kaisha Spring steel and spring having superior corrosion fatigue strength
US8789817B2 (en) 2009-09-29 2014-07-29 Chuo Hatsujo Kabushiki Kaisha Spring steel and spring having superior corrosion fatigue strength
US8936236B2 (en) 2009-09-29 2015-01-20 Chuo Hatsujo Kabushiki Kaisha Coil spring for automobile suspension and method of manufacturing the same
US10472695B1 (en) * 2010-07-19 2019-11-12 Barnes Group Inc. Induction heating of spring
US9068615B2 (en) 2011-01-06 2015-06-30 Chuo Hatsujo Kabushiki Kaisha Spring having excellent corrosion fatigue strength

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JP2002035877A (ja) 2002-02-05
JP4693211B2 (ja) 2011-06-01
US20020011090A1 (en) 2002-01-31

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